Philadelphia Apple Pie

If you grew up east of the Susquehanna, you know this version of apple pie doesn’t look like the other ones. The crust pre-bakes alone, the apples bake inside a sour cream custard rather than just their own juices, and a streusel of brown sugar, butter, and walnuts goes on near the end so the topping crisps without burning. Three distinct stages, one knockout pie.

Seven sliced apples, an egg, sour cream, sugar, vanilla, flour, and a pinch of salt make up the filling. The flour acts as the thickener that turns the sour cream into a tender custard around the apples, while the egg adds enough body for clean slices once the pie cools. The walnut topping (more brown sugar, more cinnamon, melted butter, and chopped nuts) gets sprinkled on after the filling has had time to set, then bakes for a final 15 minutes to toast and crackle. A 12-inch pan accommodates the volume; a smaller pan overflows.

Pro Tips

• Pre-bake the cinnamon-dusted crust as written. Cinnamon scorches easily, so watch the bottom of the oven.
• Choose a tart, firm apple. Granny Smith holds shape best under long bakes; sweeter varieties soften too far.
• Don’t add the streusel until the apples are cooked through. Walnuts on top from the start go bitter and dark.
• A wide pie needs a wide rest. Cool at least two hours so the custard sets completely before the first cut.

Variations

• Add a quarter cup of golden raisins to the apple filling for sweetness and chew.
• Use maple syrup in place of half the brown sugar in the streusel for a Northeast-leaning twist.
• Serve warm slices with a scoop of vanilla ice cream and a pour of the leftover sour cream custard.